The tool life of XNMF090612-F27 WKP25S are more than XNMF090612-F27 WKP25S, but they are both less than XNHF0906ANN-D27 WKK25.
The main type of wear is fractures along the cutting edge.
The geometry D27 is better than F27 in this condition.
Maybe it would be better to reduce the cutting speed, but need to be agreed with the customer, it is tough.
The average tool life of both Insert are less than 360pcs, we need to provide a new solution.